cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A339295 Number of essentially parallel unoriented series-parallel networks with n elements and without multiple unit elements in parallel.

Table of values

n a(n)
1 1
2 0
3 1
4 2
5 4
6 10
7 25
8 69
9 197
10 589
11 1806
12 5685
13 18168
14 58905
15 192904
16 637294
17 2119994
18 7094961
19 23865782
20 80642017
21 273571625
22 931389949
23 3181184007
24 10897272983
25 37429033777
26 128874546753
27 444744161951
28 1538030244174
29 5329246656885
30 18499283612755

List of values

[1, 0, 1, 2, 4, 10, 25, 69, 197, 589, 1806, 5685, 18168, 58905, 192904, 637294, 2119994, 7094961, 23865782, 80642017, 273571625, 931389949, 3181184007, 10897272983, 37429033777, 128874546753, 444744161951, 1538030244174, 5329246656885, 18499283612755]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.